The "plenty" part of Plenty of Fish's name must be taken literally. The service boasts the largest online dating user base, with more than 70 million members in its proverbial sea. In addition to messaging and browsing potential matches, the app lets you meet singles in the area with its locals feature. A Meet Me function invites you to decide, at first sight, if you want to meet someone in the area. And the app recently added a voice messaging feature. You also get to see a list of all the people who want to meet you. Upgrading to a paid account removes the adds and places your profile more prominently.